Does the advantage of transcutaneous oximetry measurements in diabetic foot ulcer apply equally to free flap reconstruction?

Table 1 Demographic characteristics of patients with diabetic foot ulcer with and without free flap

	Total (n = 47)	Free flap (n = 17)	DFU (n = 30)	P value
Sex
Male	31 (65.96)	10 (58.82)	21 (70.00)	0.437
Female	16 (34.04)	7 (41.18)	9 (30.00)
Age	61.36 ± 2.04	54.76 ± 3.62	65.10 ± 2.21	0.013
Smoking history
Non-smoker	23 (48.94)	11 (64.71)	12 (40.00)	0.104
Smoker	24 (51.06)	6 (35.29)	18 (60.00)
HbA1c	7.00 (6.00-9.10)	6.20 (5.60-9.00)	7.25 (6.10-9.20)	0.084
HTN
None	17 (36.17)	9 (52.94)	8 (26.67)	0.072
HTN	30 (63.83)	8 (47.06)	22 (73.33)
Nephropathy
None	34 (72.34)	15 (88.24)	19 (63.33)	0.094
Nephropathy	13 (27.66)	2 (11.76)	11 (36.67)
Angiosome
ATA	26 (55.32)	7 (41.18)	19 (63.33)	0.138
PTA	21 (44.68)	10 (58.82)	11 (36.67)
TcpO2	13.00 (6.00-22.00)	12.01 (8.01-15.01)	14.50 (6.00-22.00)	0.812
ABI
Affected side	1.02 ± 0.03	1.14 ± 0.03	0.95 ± 0.05	0.002
Unaffected side	1.06 ± 0.03	1.13 ± 0.02	1.03 ± 0.04	0.024
Creatinine	1.07 (0.72-3.12)	0.74 (0.63-0.86)	1.98 (0.95-6.27)	0.001
Hb	11.10 ± 0.25	11.83 ± 0.31	10.68 ± 0.33	0.024
Duration of DM (yr)	10.00 (5.50-15.00)	3.00 (1.00-10.00)	13.50 (10.00-20.00)	< 0.001
Duration of HTN (yr)	10.50 (10.00-20.00)	11.00 (2.00-20.00)	10.00 (10.00-20.00)	0.666
CRP	11.24 (4.21-35.70)	3.50 (1.70-10.57)	27.78 (8.20-73.71)	< 0.001
BMI	23.96 ± 0.71	23.84 ± 1.28	24.03 ± 0.87	0.896

ABI: Ankle-brachial index; ATA: Anterior tibial artery; BMI: Body mass index; CRP: C-reactive protein; DFU: Diabetic foot ulcer; DM: Diabetes mellitus; Hb: Haemoglobin; HbA1c: Glycosylated haemoglobin A; HTN: Hypertension; TcpO₂: Transcutaneous oxygen pressure; PTA: Posterior tibial artery.